Re: Sergei Glinkin La-5
It was either 23, or 27. The lower circle is not part of a number, it's a small side door for the mechanics. The digits are typical white, Factory No.21 (Gorkiy) numbers as part of the AC serial number. So it was either 3921xx23, or 3921xx27. The number outline was dark blue. Hope this helps.
Gabor
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